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skad [1K]
2 years ago
14

If only 0.225 g of Ca(OH)2 dissolves in enough water to give 0.100 L of aqueous solution at a given temperature, what is the Ksp

value for calcium hydroxide at this temperature
Chemistry
1 answer:
luda_lava [24]2 years ago
4 0

Answer: The K_{sp} value for calcium hydroxide at this temperature is 1.08 \times 10^{-4}.

Explanation:

Given: Mass of Ca(OH)_{2} = 0.225 g

Volume = 0.100 L

As moles is the mass of substance divided by its molar mass.

So, moles of Ca(OH)_{2} (molar mass = 74 g/mol) is calculated as follows.

Moles = \frac{mass}{molar mass}\\= \frac{0.225 g}{74 g/mol}\\= 0.003 mol

Molarity is the number of moles of substance present in a liter of solution.

Hence, molarity of given solution will be as follows.

Molarity = \frac{moles}{Volume (in L)}\\= \frac{0.003 mol}{0.1 L}\\= 0.03 M

The equation for dissociation of  Ca(OH)_{2} is as follows.

Ca(OH)_{2} \rightarrow Ca^{2+} + 2OH^{-}

This means that [Ca^{2+}] = 0.03 and [OH^{-}] = 2 \times 0.03 = 0.06. Hence, K_{sp} value for this reaction is calculated as follows.

K_{sp} = [Ca^{2+}][OH^{-}]^{2}\\= (0.03) \times (0.06)^{2}\\= 1.08 \times 10^{-4}

Thus, we can conclude that the K_{sp} value for calcium hydroxide at this temperature is 1.08 \times 10^{-4}.

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artcher [175]

Answer:

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Explanation:

The question is missing the concentration of the glucose solution. Standard glucose concentration for IV solution is 5% or 5g of glucose every 100mL of solution.  

We need to determine how many grams of glucose are there inside the solution. The number of glucose in 3.3L solution will be:  

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If glucose will give 4kcal/ g, then the total calories 165g glucose give will be: 165g * 4kcal/ g= 660kcal.

6 0
3 years ago
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Natalka [10]

Answer:

It will be reported too low.

Explanation:

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Qmetal + Qwater = 0

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The heat is the mass multiplied by the specific heat multiplied by the temperature change. If c is the specific heat of the water:

m_metal*s*ΔT_metal = - m_water *c*ΔT_water

s = -m_water *c*ΔT_water / m_metal*ΔT_metal

So, if m_water is now less than it was supposed to be, s will be reported too low, because they are directly proportional.

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A car is traveling 70km in 45 minutes. How many miles an hour is the car traveling?
labwork [276]

52

Explanation:

70x45÷60= 52

I hope this is helpful

5 0
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Hence, the correct answer is second option, that is, +3 and +6, the Zeff of boron is smaller in comparison to O, thus, boron exhibits a bigger size than O.

3 0
3 years ago
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